update_webhook · Payoza MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_webhook does on Payoza MCP Server

AI agents use update_webhook to create or update resources in Payoza MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Payoza MCP Server environment.

WHY IT NEEDS A POLICY

Why update_webhook needs a policy

This tool modifies webhook configurations, which are reversible changes (Write category). However, severity is high because compromised webhooks in a payment system could redirect transaction notifications, enabling fraud detection evasion, payment interception notifications, or malicious event handling.

From the tool's definition Tool name 'update_webhook' and description 'Update an existing webhook by ID. Only provided fields are updated.' indicate modification of existing webhook configuration.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_webhook Rate-limited

update_webhook stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_webhook": {
      "limits": [
        {
          "counter": "update_webhook_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Payoza MCP Server, so you can run agents against it safely.

FAQ

Questions about update_webhook

What does the update_webhook tool do? +

Update an existing webhook by ID. Only provided fields are updated. It is categorised as a Write tool in the Payoza MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_webhook? +

Register the Payoza MCP Server MCP server in PolicyLayer and add a rule for update_webhook: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Payoza MCP Server. Nothing to install.

What risk level is update_webhook? +

update_webhook is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update_webhook? +

Yes. Add a rate_limit block to the update_webhook rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block update_webhook completely? +

Set action: deny in the PolicyLayer policy for update_webhook. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides update_webhook? +

update_webhook is provided by the Payoza MCP Server MCP server (payoza/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.